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 * modification, are permitted provided that the following conditions are
 * met:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
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 * copyright notice, this list of conditions and the following disclaimer
 * in the documentation and/or other materials provided with the
 * distribution.
 *     * Neither the name of Google Inc. nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#include "flutter/sky/engine/public/platform/Platform.h"

#include "flutter/sky/engine/platform/fonts/FontPlatformData.h"
#include "flutter/sky/engine/platform/graphics/GraphicsContext.h"
#include "third_party/skia/include/core/SkTypeface.h"

namespace blink {

static SkPaint::Hinting skiaHinting = SkPaint::kSlight_Hinting;
static bool useSkiaAutoHint = true;
static bool useSkiaBitmaps = true;
static bool useSkiaAntiAlias = true;
static bool useSkiaSubpixelRendering = false;

void FontPlatformData::setHinting(SkPaint::Hinting hinting) {
  skiaHinting = hinting;
}

void FontPlatformData::setAutoHint(bool useAutoHint) {
  useSkiaAutoHint = useAutoHint;
}

void FontPlatformData::setUseBitmaps(bool useBitmaps) {
  useSkiaBitmaps = useBitmaps;
}

void FontPlatformData::setAntiAlias(bool useAntiAlias) {
  useSkiaAntiAlias = useAntiAlias;
}

void FontPlatformData::setSubpixelRendering(bool useSubpixelRendering) {
  useSkiaSubpixelRendering = useSubpixelRendering;
}

void FontPlatformData::setupPaint(SkPaint* paint,
                                  GraphicsContext* context) const {
  paint->setAntiAlias(m_style.useAntiAlias);
  paint->setHinting(static_cast<SkPaint::Hinting>(m_style.hintStyle));
  paint->setEmbeddedBitmapText(m_style.useBitmaps);
  paint->setAutohinted(m_style.useAutoHint);
  if (m_style.useAntiAlias)
    paint->setLCDRenderText(m_style.useSubpixelRendering);

  // Do not enable subpixel text on low-dpi if full hinting is requested.
  bool useSubpixelText = paint->getHinting() != SkPaint::kFull_Hinting ||
                         (context && context->deviceScaleFactor() > 1.0f);

  // TestRunner specifically toggles the subpixel positioning flag.
  if (useSubpixelText)
    paint->setSubpixelText(true);
  else
    paint->setSubpixelText(m_style.useSubpixelPositioning);

  const float ts = m_textSize >= 0 ? m_textSize : 12;
  paint->setTextSize(SkFloatToScalar(ts));
  paint->setTypeface(m_typeface);
  paint->setFakeBoldText(m_syntheticBold);
  paint->setTextSkewX(m_syntheticItalic ? -SK_Scalar1 / 4 : 0);
}

void FontPlatformData::querySystemForRenderStyle(
    bool useSkiaSubpixelPositioning) {
  m_style.useBitmaps = 2;
  m_style.useAutoHint = 2;
  m_style.useHinting = 2;
  m_style.hintStyle = 0;
  m_style.useAntiAlias = 2;
  m_style.useSubpixelRendering = 2;
  m_style.useSubpixelPositioning = 2;

  // Fix FontRenderStyle::NoPreference to actual styles.
  if (m_style.useAntiAlias == FontRenderStyle::NoPreference)
    m_style.useAntiAlias = useSkiaAntiAlias;

  if (!m_style.useHinting)
    m_style.hintStyle = SkPaint::kNo_Hinting;
  else if (m_style.useHinting == FontRenderStyle::NoPreference)
    m_style.hintStyle = skiaHinting;

  if (m_style.useBitmaps == FontRenderStyle::NoPreference)
    m_style.useBitmaps = useSkiaBitmaps;
  if (m_style.useAutoHint == FontRenderStyle::NoPreference)
    m_style.useAutoHint = useSkiaAutoHint;
  if (m_style.useAntiAlias == FontRenderStyle::NoPreference)
    m_style.useAntiAlias = useSkiaAntiAlias;
  if (m_style.useSubpixelRendering == FontRenderStyle::NoPreference)
    m_style.useSubpixelRendering = useSkiaSubpixelRendering;

  // TestRunner specifically toggles the subpixel positioning flag.
  if (m_style.useSubpixelPositioning == FontRenderStyle::NoPreference)
    m_style.useSubpixelPositioning = useSkiaSubpixelPositioning;
}

bool FontPlatformData::defaultUseSubpixelPositioning() {
  return FontDescription::subpixelPositioning();
}

}  // namespace blink
